Prawn Suit Grappling Arm Bug?

[Dante Silver Fox_DSF]

I don't know if this is common but when i hook the grappling to the seafloor (preferably the hill), sometime the prawn suit just walk like the water becomes the seafloor even though there's no floor to walk on.

It lasted as long as i hold the W key or updating like grappling, drilling or punching. Is there any explanation for that?